The policy evaluation completed log is incorrect for response evaluation

[davidebianchi]

Describe the bug

When it's used a policy to filter a response body, in log allowed field is set to false, also if all works correctly.
An example log for the policy foo is:

{"allowed":false,"evaluationTimeMicroseconds":123,"level":20,"matchedPath":"/api/","method":"GET","msg":"policy evaluation completed","partialEval":false,"policyName":"foo","reqId":"req-id","requestedPath":"/api/"}

Expected behavior

We expect a more correct information. Allowed false is the output from opa, but from rond this is evaluated as allowed and change the response body.

Replication info

There are the SDK tests which highlight this behaviour:

rond/core/sdk_test.go

Lines 600 to 620 in 7d71122

	t.Run("logger", func(t *testing.T) {
	var actual *logrus.Entry
	for _, entry := range hook.AllEntries() {
	if entry.Message == "policy evaluation completed" {
	actual = entry
	}
	}
	evaluatorInfo := evaluate.(evaluator)
	require.NotNil(t, actual)
	delete(actual.Data, "evaluationTimeMicroseconds")
	require.Equal(t, logrus.Fields{
	"allowed": false,
	"requestedPath": testCase.path,
	"matchedPath": evaluatorInfo.evaluatorOptions.RouterInfo.MatchedPath,
	"method": testCase.method,
	"partialEval": false,
	"policyName": evaluate.Config().ResponseFlow.PolicyName,
	"resultsLength": 1,
	}, actual.Data)
	})